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☛ Official ☚ The Big & Dandy Scale / Balance Thread - Part 2.000±

MagickalKat777 said:
How is a balance that measures in .0001mg not microgram when .001mg is 1mg?
Click to expand...

Because the Mettler AC100 measures with an accuracy of 0.0001g=0.1mg in its full range upto 100g, as stated on the auction site and not in 0.0001mg devisions as you wrote.

I've seen microgram balances occasionally go on ebay but they usually have an upper weighing limit of 5g.
 
parcival said:
Because the Mettler AC100 measures with an accuracy of 0.0001g=0.1mg in its full range upto 100g, as stated on the auction site and not in 0.0001mg devisions as you wrote.

I've seen microgram balances occasionally go on ebay but they usually have an upper weighing limit of 5g.
Click to expand...

That was a typing error on my part. 0.1mg is still accurate to +/- 100ug.
 
MagickalKat777 said:
Not worth the money. Very accurate but drifts easily... Honestly you could just get an old generation lab balance from eBay for cheap... these are microgram balances...

Like this one..

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190444197617&ssPageName=STRK:MEWAX:IT

It measures a 1g weight (that's not a high quality one anyway) at 1.0008mg... not bad accuracy at all. Needs some cleanup from corrosion but honestly, that's a steal for a microgram balance. Just set your shit on a tray... this is a real professional scale...
Click to expand...

whats it called? What did u search on ebay to find it?
 
You can still see the product he was talking about even though it's expired.

Mettler AC 100 digital analytical scale
 
so what's the current concensus on scales used for RC chemicals (need accurate mg here, not 5-10 mg off each time............ NOPE)

it needs an upward limit of at LEAST 5g also, though 10 would be ideal.
 
well there was another thread, but it disappeared. i had a big old response typed up, so here it is :P


X3DFX said:
Okay, I suppose I can appreciate all the concerns and speculations into my intentions.

So tell me then, What do I want and why do I want it? Give it to me straight, top to bottom.
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A US$20 scale has served me quite well for 2C-x and other compounds active in the 20mg range. As long as you don't bang it around, keep it clean, and always have fresh batteries on hand they're quite accurate. Like ALL scales (even the $5000 ones) they are sometimes 1000% inaccurate when weighing anything in the vicinity of 0.001g (1mg). Always weigh at least 0.010g (10mg) of material at one time.

Proper balance technique involves a flat, stable, air-current-free workspace that is free of other electric, electronic, or magnetic devices. A scale generally does not need to warm up, but if your batteries are not fresh you may notice a drifting inaccuracy.

Turn on the scale and press TARE. It should read zero and be stable. Place the weighing dish on the pad and record the mass. Repeat 3 times and take an average. Ideally all the numbers will be the same. You should keep this information with the dish and use it as a calibration check.

Do not re-tare the scale. It is at its highest accuracy when it is measuring the mass of the dish plus the mass of your compound.

Using a static-free clean spatula (stainless steel works best), place a small amount of material in the dish. Record the new mass displayed. If your material is homogeneous, you should be able to compare the visual appearance of your compound with its indicated mass.

THIS IS THE ONLY TIME IT IS SAFE TO "EYEBALL": estimate the amount of compound you will need to add in order to get the desired amount of total compound. Use a pencil and write down the number that you are shooting for, and what it means (subtract the weight of the dish on paper). This is to minimize accidental weighing of too much compound and trying to put it back into its original container.

Add small amounts of compound to the dish until you are close to the correct value. Be sure to write down the ACTUAL final mass of compound. Gently remove the dish from the scale and ensure that it still returns to zero without you pressing TARE. Placing the dish back on the scale should return it to the recorded weight.

Transfer the compound into your appropriate vehicle (if it is a single dose) or clean container that you will use for liquid measurement. Use your ACTUAL value of mass (for example, 2.446g dish+compound minus 2.203g dish equals 0.243g or 243mg of compound) when performing the appropriate liquid measurement calculations (found in the B&D thread on that topic). You should be able to rinse the weighing dish into your liq container to ensure 99.9% transfer of the compound.
 
greenmeanies said:
well there was another thread, but it disappeared. i had a big old response typed up, so here it is :P




A US$20 scale has served me quite well for 2C-x and other compounds active in the 20mg range. As long as you don't bang it around, keep it clean, and always have fresh batteries on hand they're quite accurate. Like ALL scales (even the $5000 ones) they are sometimes 1000% inaccurate when weighing anything in the vicinity of 0.001g (1mg). Always weigh at least 0.010g (10mg) of material at one time.

Proper balance technique involves a flat, stable, air-current-free workspace that is free of other electric, electronic, or magnetic devices. A scale generally does not need to warm up, but if your batteries are not fresh you may notice a drifting inaccuracy.

Turn on the scale and press TARE. It should read zero and be stable. Place the weighing dish on the pad and record the mass. Repeat 3 times and take an average. Ideally all the numbers will be the same. You should keep this information with the dish and use it as a calibration check.

Do not re-tare the scale. It is at its highest accuracy when it is measuring the mass of the dish plus the mass of your compound.

Using a static-free clean spatula (stainless steel works best), place a small amount of material in the dish. Record the new mass displayed. If your material is homogeneous, you should be able to compare the visual appearance of your compound with its indicated mass.

THIS IS THE ONLY TIME IT IS SAFE TO "EYEBALL": estimate the amount of compound you will need to add in order to get the desired amount of total compound. Use a pencil and write down the number that you are shooting for, and what it means (subtract the weight of the dish on paper). This is to minimize accidental weighing of too much compound and trying to put it back into its original container.

Add small amounts of compound to the dish until you are close to the correct value. Be sure to write down the ACTUAL final mass of compound. Gently remove the dish from the scale and ensure that it still returns to zero without you pressing TARE. Placing the dish back on the scale should return it to the recorded weight.

Transfer the compound into your appropriate vehicle (if it is a single dose) or clean container that you will use for liquid measurement. Use your ACTUAL value of mass (for example, 2.446g dish+compound minus 2.203g dish equals 0.243g or 243mg of compound) when performing the appropriate liquid measurement calculations (found in the B&D thread on that topic). You should be able to rinse the weighing dish into your liq container to ensure 99.9% transfer of the compound.
Click to expand...

Agreed, my advice to go with this is instead of weighing only 50mg and trying to separate it into 10mg doses, put more weight on so it is say 0.5g, this makes it more accurate when separating doses in my experience.
 
I hope by "separating doses" you mean liquid measurement, because weighing out 0.5g and then splitting it into 20mg doses by eyeballing makes ABSOLUTELY no sense.

Liquid measurement is only precise if you use enough solvent... dissolving 0.5g of compound in 0.5L water (1mg/mL) is better than the same compound in 0.050L water (10mg/mL). The precision of your liquid-measuring instrument (like a 10mL syringe with 1mL graduations, or a 1mL syringe with 0.1mL graduations) will determine the final precision of your dose.
 
I got a Denver Instruments SI-234 that looks almost brand new on eBay for 126 bucks.

It begins picking up readings at .1mg and it is +/- .2mg at the most. FANTASTIC piece of machinery. I was plum embarrassed when I compared my GemPro 250 to it... GemPro was off by as much as 5mg on sub-15mg amounts and off by as much as 3-6 above that... The repeatability with this scale is 100% and it self-calibrates (built in 100g calibration weight). Also, it "cycles" so you don't run into the problem with the lesser scales not picking up small amounts of weight being added to account for drift. You have to wait about 2 seconds after placing something on there before it counts up but its dead accurate.

Seriously, these scales are the only way to go.
 
Just re-stating what almost everyone in this thread has said. Triple check your dose weight and make sure the scale is calibrated correctly. A 45mg dose of 2c-I was the price I paid after realizing my crappy 25$ scale was like 13mg off.
 
My gempro-250 has been absolutely amazikng and has treated me well for about 8 months or so now, would recommend this scale to anyone for weighing out RC's :)
 
Xtc <3 said:
My gempro-250 has been absolutely amazikng and has treated me well for about 8 months or so now, would recommend this scale to anyone for weighing out RC's :)
Click to expand...

Some are total duds - like mine. I should post a Youtube video of mine one of these days when I am not feeling lazy. It will literally work when on the 2mg setting but on the 1mg setting, I turn it on, it says some random weight is already on the scale. Then when I put something on it, it weighs off anywhere from 1-6mg compared to my .1mg lab balance I bought to replace it - plus the lab balance was 50 bucks less :p
 
i have one that looks identical to the first one (AWS G-20) and it works perfectly.

i'm guessing that the second one is probably the same thing on the inside, just with different plastic housing.

either one should be fine as long as you follow proper balance technique (see my other post above)
 
proscale precision-10 or gemological 10

Hi rc weighing bluelighters, I have a problem for you should you choose to solve it for me!

I own this scale and use it to weigh: http://www.proscale.net/proscale_precision_10.htm

it works great, and it's cheap online (like 20-30 bucks marked down from 70), I use it all the time.

-But, I lost the instructions for how to calibrate it. I like to calibrate it before I use it, can any BLer that has it and still has that little card tell me how to calibrate it?


I emailed the company some time ago and they never responded.
 
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